AC Blowing Hot? Let's Chill Out.

01 · It's Blowing Warm Air

The outside unit hums, but the fan won't spin.

System runs but the house keeps getting hotter? Step outside and listen. A hum with a still fan usually means one of two parts: a failed run capacitor — the part that gives the compressor and fan motor their kick to start — or a condenser fan motor that has seized or burned out. A domed capacitor top is one giveaway; a tech's meter tells which it is.

On our truckRun capacitors & universal fan motors

Universal motors fit most units; high-efficiency units often need a factory motor we order in.

1. The thermostat calls for cooling
2. The contactor pulls in — click
3. The compressor hums, but the fan never spins
4. One suspect: the capacitor's top has domed up
5. The other: a seized fan motor — same hum, same still fan

02 · Won't start

It clicks or chatters, but never starts.

The contactor is the switch the thermostat flips to power the outdoor unit. Its contacts pit and burn with age — and fire ants crawl in and jam them. You hear a click or a buzz, and nothing starts.

On our truckContactors

1. The thermostat calls for cooling
2. 24 volts reach the contactor — it chatters
3. Fire ants and burnt contacts block the power
4. Compressor and fan never start

03 · I See Ice on the Unit

Pipes are white or a block of ice is visible.

When too little air crosses the indoor coil — a clogged filter, blocked vents, a blower problem or low refrigerant — the coil drops below freezing. The ice grows, and the cold runs out the big copper line to the outdoor unit, where ice shows on the bare copper and valves.

1. Airflow drops — a clogged filter is a common cause
2. The coil falls below freezing and ices over
3. The cold runs out the big line — ice shows where the copper is bare
4. Outside, the pipes turn white

04 · Water leaks

The AC just stops — and there's water where it shouldn't be.

Your AC pulls water out of humid lake air. It drips into a pan under the indoor coil and runs out a drain line. When algae and slime clog that line, the pan fills and a float switch shuts the AC off (or the fan keeps blowing but nothing cools) before the water reaches your floor or ceiling.

1. Condensate drips into the pan and out the drain
2. Algae and slime clog the drain line
3. Water rises in the pan
4. The float switch lifts and trips
5. The cooling call drops — the AC just stops

05 · Weak on hot afternoons

Weak cooling on the hottest afternoons.

When outdoor temps hit 100°F+ (common around Grand Lake from June through August), your AC works hardest. Cottonwood fluff, grass clippings, dryer lint and dust mat the condenser coil, less air gets through, and the system runs hotter — until the compressor trips off to protect itself while the fan keeps running.

1. Clean fins: the heat pours out the top
2. Cottonwood, lint and dust mat the fins
3. Less air gets through — it runs hotter
4. The compressor trips off — the fan keeps running, the house stops cooling